Formation of The Cave Diving Group
After World War II surplus oxygen rebreather equipment became available, and the number of divers increased. In 1946 these enthusiasts had a meet in South Wales during which they formed the Cave Diving Group. Wookey Hole once more became the focus of diving activities. In addition to exploration, the early divers found a lot of archaeological material.
As the divers penetrated deeper into the cave, the need for penetration below 9 m (30 ft) (the safe limit of oxygen diving) became more urgent, and the first attempt with an early aqualung nearly ended in tragedy. Following this incident, the group concentrated on the use of semi-closed circuit rebreathers with oxygen/nitrogen mixtures (nitrox) suitable for the depth. In 1960 the way forward at Wookey Hole was found at a depth of 21 m (69 ft), using 60/40 O2/N2. Rebreathers were also used successfully in South Wales, Derbyshire and Yorkshire.
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